package api

import (
	"net/http"
	"strconv"
	"time"

	"browser.local/platform/domain"
	"browser.local/platform/dto"
)

// runMetricBatchIngest godoc
// @Summary Ingest bounded Run metric samples
// @Description Persists a signed bounded metric batch for server instances owned by the Run endpoint.
// @Tags run-metrics
// @Accept json
// @Produce json
// @Param body body dto.MetricBatchIngestRequest true "Metric batch"
// @Success 200 {object} dto.MetricBatchIngestResponse
// @Failure 400 {object} dto.ErrorResponse
// @Failure 401 {object} dto.ErrorResponse
// @Router /api/v1/run/metrics/batches [post]
func (h *coreHandlers) runMetricBatchIngest(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeMethodNotAllowed(w, http.MethodPost)
		return
	}
	request, err := decodeJSON[dto.MetricBatchIngestRequest](r)
	if err != nil {
		writeDecodeError(w, err)
		return
	}
	result, err := h.core.IngestMetricBatch(request.ToDomain())
	if err != nil {
		writeServiceError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, dto.MetricBatchIngestFromDomain(result))
}

// metricHistory godoc
// @Summary Query persisted server metric samples
// @Description Returns an owner-authorized bounded metric history without machine credentials or fencing state.
// @Tags metrics
// @Produce json
// @Success 200 {object} dto.MetricSampleListResponse
// @Failure 401 {object} dto.ErrorResponse
// @Failure 403 {object} dto.ErrorResponse
// @Router /api/v1/metrics/server-instances/history [get]
func (h *coreHandlers) metricHistory(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeMethodNotAllowed(w, http.MethodGet)
		return
	}
	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
	items, err := h.core.ListMetricSamplesForSession(bearerToken(r), domain.MetricSampleFilter{ServerInstanceID: r.URL.Query().Get("serverInstanceId"), After: parseQueryTime(r.URL.Query().Get("after")), Before: parseQueryTime(r.URL.Query().Get("before")), Limit: limit})
	if err != nil {
		writeServiceError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, dto.MetricSampleListFromDomain(items))
}

// backups godoc
// @Summary Create or list durable backup records
// @Description Creates or returns owner-authorized backup metadata and recovery state.
// @Tags backups
// @Accept json
// @Produce json
// @Success 200 {object} dto.BackupListResponse
// @Success 201 {object} dto.BackupResponse
// @Failure 401 {object} dto.ErrorResponse
// @Failure 403 {object} dto.ErrorResponse
// @Router /api/v1/backups [get]
// @Router /api/v1/backups [post]
func (h *coreHandlers) backups(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		items, err := h.core.ListBackupsForSession(bearerToken(r), domain.BackupFilter{ServerInstanceID: r.URL.Query().Get("serverInstanceId"), State: domain.BackupState(r.URL.Query().Get("state"))})
		if err != nil {
			writeServiceError(w, err)
			return
		}
		writeJSON(w, http.StatusOK, dto.BackupListFromDomain(items))
	case http.MethodPost:
		request, err := decodeJSON[dto.BackupCreateRequest](r)
		if err != nil {
			writeDecodeError(w, err)
			return
		}
		record, err := h.core.CreateBackupForSession(bearerToken(r), request.ToDomain())
		if err != nil {
			writeServiceError(w, err)
			return
		}
		writeJSON(w, http.StatusCreated, dto.BackupFromDomain(record))
	default:
		writeMethodNotAllowed(w, "GET, POST")
	}
}

// backupDetail godoc
// @Summary Get one durable backup record
// @Tags backups
// @Produce json
// @Success 200 {object} dto.BackupResponse
// @Failure 401 {object} dto.ErrorResponse
// @Failure 403 {object} dto.ErrorResponse
// @Failure 404 {object} dto.ErrorResponse
// @Router /api/v1/backups/{id} [get]
func (h *coreHandlers) backupDetail(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeMethodNotAllowed(w, http.MethodGet)
		return
	}
	record, err := h.core.GetBackupForSession(bearerToken(r), r.PathValue("id"))
	if err != nil {
		writeServiceError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, dto.BackupFromDomain(record))
}

func parseQueryTime(value string) time.Time {
	parsed, _ := time.Parse(time.RFC3339Nano, value)
	return parsed
}